/* 
 *      LiteralToken.java
 *
 *      Copyright 2008 Pablo Nicolas Diaz Bilotto <pablonicolas.diaz@gmail.com>
 *
 *      This program is free software; you can redistribute it and/or modify
 *      it under the terms of the GNU General Public License as published by
 *      the Free Software Foundation; either version 2 of the License, or
 *      (at your option) any later version.
 *
 *      This program is distributed in the hope that it will be useful,
 *      but WITHOUT ANY WARRANTY; without even the implied warranty of
 *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *      GNU General Public License for more details.
 *
 *      You should have received a copy of the GNU General Public License
 *      along with this program; if not, write to the Free Software
 *      Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 *      MA 02110-1301, USA.
 */
package lexer.token;


/**
 * The Class LiteralToken.
 */
public class LiteralToken extends Token {

	/** The instance. */
	private static LiteralToken instance = null;

	/**
	 * Gets the single instance of LiteralToken.
	 * 
	 * @param Ln the ln
	 * @param X the x
	 * 
	 * @return single instance of LiteralToken
	 */
	public static LiteralToken getInstance(int Ln, int X) {
		if (null == instance) {
			instance = new LiteralToken(Ln, X);
		} else {
			instance.setLineNro(Ln);
			instance.setLiteral(X);
		}
		return instance;
	}

	/** The literal. */
	private int literal;

	/**
	 * Instantiates a new literal token.
	 * 
	 * @param Ln the ln
	 * @param X the x
	 */
	private LiteralToken(int Ln, int X) {
		super(Ln, TokenEnum.LITERAL);
		this.setLiteral(X);
	}

	/**
	 * Gets the literal.
	 * 
	 * @return the literal
	 */
	private int getLiteral() {
		return literal;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see lexer.token.Token#getValue()
	 */
	@Override
	public Object getValue() {
		return ((char) getLiteral());
	}

	/**
	 * Sets the literal.
	 * 
	 * @param literal the new literal
	 */
	private void setLiteral(int literal) {
		this.literal = literal;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see lexer.token.BaseToken#setValue(java.lang.Object)
	 */
	public void setValue(Object literal) {
		/* this.literal = literal; */
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see lexer.token.Token#token_to_yacc()
	 */
	@Override
	public int token_to_yacc() {
		return getLiteral();
	}

}
